Tackle-block.



BATBNTBD SBPT.15. 1903.

H. W. STOCKING.

TAGKLE BLOCK.

y APPLICATION FILED 2113.4. 1903.

xo MODEL.

Ml I Vzorriy,

Patented September 15, 1903.

PATENT OFEicE.

HENRY W. STOCKING, OF AVALON, CALIFORNIA.

TACKLE-BLOCK.

SPECIFICATION forming part of Letters Patent No. 739,119, dated September 15, 1903.

Application le. February 4, 1903. Serial No. 141,936. (No model.)

To a/ZZ whom it may concern: I Be it known that l, HENRY W. STocKING, of Avalon, in the county of Los vAngeles and State of California, have invented new and useful Improvements in Tackle-Blocks, of which the following is a specification.

Myinvention consists in'providing self-locking means for tackle-blocks; and the object is to provide a tackle-block which will automatically lock itself when the operator slackens on the rope to which the weight being raised is attached. I accomplish this object by means of the device herein described, and shown in the accompanying drawings, in which- Y Figure l is a side elevation of a tackle-block embodying my invention. Fig.` 2 is a side elevation, partly broken away. Fig. 3 is an edge view. Fig. 4. is a fragmentary view of the strap A, showing the slot A' therein.

In the drawings, A is the side straps of the block, in each of which is a slot A for the reception of the'projecting ends of the main sheave B, which carries the rope D. The coniiguration of the slot is shown in Fig. 4.. has an upper and a lower resting-seat a and d', respectively, for the supporting projecting ends of the axle C, the purpose being to form a firm support for the sheave B while in its elevated position, as shown in Fig. 1, and a irm support while in the depressed position.v (Shown in Fig. 2.) When the sheave is in its elevated position, (shownin Fi g. 1,) it will haveV crowded the rope D up against the periphery of the eccentrically-mounted sheave or camroller F and locked the rope against movement in direction of the end D, on which the weight is attached, and will securely hold the same in this position and prevent the weight secured to this end from falling. This condition will result whenever the force (which is appliedby the hand to the end D' of the rope in elevating the weight attached to the other end) is removed. WVhen the D end of the rope is released, the springs G, mounted on the outside of the straps A, will throw the axle C out of the lower seat a into the upper seat d. This upward movement of the axle will carry with it the cam-actuating arm H, loosely mounted at its lower end on the axle C and pivotally mounted on the cam-roller F, close to the periphery thereof. ln moving up with the axle it will cause thevcam-roller to swing from the position shown in Fig. 2 (which is the position of thek sheave A and the caniroller F when power is applied to the D' end of the rope) into the position shown in Fig. l, being the locked, or elevated position of the sheave A and the depressed or locked position of the cam-roller when the power is removed from the D end of the rope. Then power is applied to the end D of the rope, the pressure thereon will overcome the tension of the spring G, which is to hold the sheave in its elevated locked position, `as in Fig. 1, and to bring the sheave down into its depressed operative position, as shown in Fig. 2. the cam-actuating arm H meanwhile carrying the cam-wheel into its elevated and unlocked position. (Shown Having described my invention, what I claim as new, and desire to secure by Letters Patent, is- Y l. The herein-described automaticallydocking tackle-block, comprising a main sheave revolubly mounted in side straps, the axle of the sheave projecting through slots in the side straps; side straps having' composite slots therein, the said slots having two axlesupporting seats, one seat being disposed above the other, the-axle of the main sheave adapted to project into and through said slot and engage springs on the outside of the side straps; axle-engaging springs on the side of the straps adapted to throw the axle of the sheave into the upper seat in the slot; acamroller above the main sheave journaled in bearings in the side straps; an arm pivoted at its upper end on the side of the cam-roller close to the periphery thereof, the lower end of the arm revolubly mounted on the axle of the main sheave.

2. A tackle -blocl comprising a sheaverame; a main rope-carrying sheave revolubly mounted therein having an axle projecting on both sides thereof through a composite slot in the sides of the frame, the said slots each having two axle-supporting seats, one disposed above the other; a cam-roller revolubly mounted in said frame above the main sheave, the cam-roller having pivoted on the side thereof an actuating-arm; an -actuatingarm revolubly mounted at one end on the axle of the main sheave and the other end pivoted to the cani-roller; springs on the outside of the frame adapted to engage the projecting ends of the axle of the main sheave and to crowd the saine into the upper seats in the slot and hold the same therein.

The herein-described self-locking tackleblock comprising the side straps A, having therein in each strap a Slot A', the slot being provided with two axle-supporting seats a and a'; a main sheave B revolubly mounted in and between said side straps, and h'aving axle C projecting on each side thereof; a caniroller F revolubly mounted in said side straps above said sheave; a cam-roller -actuating arm H loosely mounted on said aXle at one end and pivoted at the other end on the cam- HENRY w. s'rooKiNe.

\Vitnesses:

I-IENRY'T. HAZARD, G. P. I-IARPHAM. 

